In a large sauce pan, bring 3 cups of the water to a boil. Add rice.
In a bowl, combine peanut butter with remaining cup of water. Stir until peanut butter is nearly all dissolved. Add mixture to cooking rice. Allow water to return to a boil and add the wheat, millet or corn flour.
When cereal nears desired thickness, remove from heat, stir in lemon juice and cover.
Add milk and sugr to achieve desired sweetness and thickness.